Caffeine guards against certain skin cancers at the molecular level, according to a study published Aug. 15 in the Proceedings of the National Academy of Sciences (PNAS). Senior author Paul Nghiem, UW associate professor of dermatology and pathology, and his colleagues genetically modified mice so the rodents would have diminished function of a protein enzyme, known as ATR, in their skin. ATR helps the body repair damaged DNA. Read more in UW Medicine Online News